As I understand this you have completely wiped your /dev/sda drive and filled it with zeros. There is no longer any ext4 file system to mount. Your drive is fine. You need instruction on how to install Ubuntu and Windows. Is this an accurate representation?
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Elder GeekJun 18 '14 at 23:59

@ElderGeek I don't think he still needs fix for it... A year has passed since he asked.
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DanatelaJun 19 '14 at 4:17

1

@ElderGeek No doubt a year has been passed but still the problem persist.I have tried every procedure mentioned in my query and also in comments above but still the HDD unable to install any OS
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Aditya SinghalJun 20 '14 at 19:21